WO2020134196A1

WO2020134196A1 - Insulation processing technique for superconducting magnet outlet end having y-shaped tail structure

Info

Publication number: WO2020134196A1
Application number: PCT/CN2019/105978
Authority: WO
Inventors: 王春雨; 胡兵; 宋云涛; 陆坤; 沈光; 俞小伍
Original assignee: 中国科学院合肥物质科学研究院
Priority date: 2018-12-25
Filing date: 2019-09-16
Publication date: 2020-07-02
Also published as: CN109755015A; CN109755015B

Abstract

Disclosed is an insulation processing method for a superconducting magnet outlet tail having a Y-shaped tail structure. According to the special shape of the outlet tail, an insulation stacked wrap is wrapped around the outlet tail to implement insulation processing. The present invention provides a practical solution for full coverage with uniformly sized insulation material on the surface of a conductor of a coil having a Y-shaped geometric structure. The invention has a simple structure and can meet the requirements on the insulation strength and size.

Description

Insulation treatment process of Y-tail structure superconducting magnet outlet end

Technical field

The invention relates to the field of insulation treatment methods for fusion devices, in particular to an insulation treatment method for the outlet end of a superconducting magnet with a Y-shaped tail end structure.

Background technique

Thermonuclear fusion energy will provide humanity with inexhaustible energy as a clean and sustainable energy in the future. To achieve this goal, the International Thermonuclear Fusion Test Reactor (ITER) will be built and tested within the next ten years. The manufacture of superconducting coils, which provide high-temperature plasma constraints for fusion, will be an extremely important part of the plan. Since the superconducting coil works in a very harsh environment, the insulation of the coil must meet the electrical insulation performance requirements under complex mechanical, electromagnetic and thermal stress loads. In the actual manufacturing process of coil insulation. The insulation wrapping treatment of the irregular shape of the coil becomes the key point that affects the performance of the coil after insulation vacuum pressure impregnation. At present, there is no ready-made experience for the insulation treatment method of the superconducting magnet with Y-shaped tail end before and after resin impregnation.

Summary of the invention

The object of the present invention is to provide an insulation treatment method for the outlet end of a superconducting magnet with a Y-shaped tail end structure to solve the problems in the prior art.

In order to achieve the above objectives, the technical solutions adopted by the present invention are:

An insulation treatment method for the outlet end of a superconducting magnet with a Y-shaped tail structure. The outlet end of the superconducting magnet includes a superconductor and a conductor end piece. One end of the superconductor tail side is connected to the side of the conductor end piece by welding to form a Y-shaped structure. The superconductor serves as a fork of the Y-shaped structure. In the conductor end piece, the section from the superconductor connection to the end of the conductor end piece serves as the other fork of the Y-shaped structure, and the section from the superconductor connection point to the other end of the conductor end piece serves as The root of the Y-shaped structure is characterized by the following steps:

1) First, wrap the Y-shaped structure tail end connection with a layer of glass fiber cloth, cut the Y-shaped tail end connection glass fiber cloth, and wrap the cut glass fiber cloth onto the conductor, using polyimide tape Fixing; Wrap a layer of glass cloth at the end of the conductor from the Y-shaped structure connection, and use polyimide tape to fix it; Wrap a layer of glass cloth at the other end of the end of the conductor from the Y-shaped conductor connection; Then wrap the glass cloth Trim to the required size;

2) According to the method of step 1), wrap a layer of polyimide film on the inner and outer glass fiber cloth of the outlet end of the superconducting magnet, trim it to a distance of 4mm from the edge of the glass fiber cloth, and fix the edge with polyimide tape;

3) Lay a layer of glass cloth and a layer of polyimide film on the inside of the bifurcation at the Y-shaped connection, and use polyimide tape to fix the ends;

4) From the Y-shaped connection point of the conductor, a layer of GK tape is half-wrapped 140 mm forward from the other end of the tail end piece of the conductor, the GK tape is a laminated structure of glass ribbon and polyimide film, K is below, G is above After wrapping to the Y-shaped end, cut the polyimide film in the GK tape, wrap the glass ribbon to the end of the Y-shaped end of the superconductor, and then smoothly transition to the conductor end welding part, and According to the GK tape structure half-wrapped on the end piece of the conductor, wrapped to a distance of 100mm;

5) The corresponding superconductor is half-wrapped according to the GK tape structure, 40 mm away from the upper edge of the superconductor wrapped in glass cloth in step 1);

6) Follow the method from step 1) to step 5), and perform 4 more operations;

7) From the Y-shaped connection point of the conductor to the other end of the conductor end piece 140mm forward, half-wrapped a layer of glass ribbon; wrap to the Y-shaped tail end, wrap the glass ribbon to the end of the Y-shaped superconductor distance Afterwards, the transition to the conductor tail is smooth, and the conductor tail is wrapped to a distance of 100mm;

8) Wrap the glass ribbon on the corresponding superconductor in a half-stack to a distance of 40 mm from the upper edge of the superconductor in step 1).

Further, the glass cloth at the Y-shaped end is: 125 mm wide and 0.25 mm thick high-strength glass cloth; the size of the polyimide film is: 0.05 mm thick; G in the GK tape is 40 mm wide and 0.25 mm thick High-strength glass ribbon, K is 32mm wide and 0.025mm thick polyimide film.

Further, the outlet end of the superconducting magnet is finally filled and cured by an insulation method impregnated with vacuum pressure.

The invention works in a vacuum and low temperature environment, and is suitable for wrapping the insulating material with special geometric structure in the low-temperature superconducting coil before the insulation impregnation. The invention has good application value in the field of fusion reactor superconducting coil manufacturing.

In fact, as long as it is desired to work under vacuum, low temperature, and the insulation material of the Y-shaped tail portion of the superconducting magnet with GK or GKG insulation structure can refer to the technical solution of the present invention, but any technology that does not deviate from the present invention The content of the solution is only a simple modification of the structure according to the technical essence of the present invention, or equivalent changes and modifications, which shall fall within the scope of the technical solution of the present invention.

The advantages of the present invention are:

The structure of the invention is simple, the operation is simple, and the requirements on insulation strength and size are ensured at the same time.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of the structure of the outlet end of the superconducting magnet of the present invention.

FIG. 2 is a diagram of the process of wrapping the glass cloth of the Y-shaped end piece of the superconducting magnet of the present invention.

FIG. 3 is a diagram of the wrapping process of the polyimide film of the Y-shaped end piece of the superconducting magnet of the present invention.

4 is a diagram of the process of laying the glass fiber cloth and polyimide film inside the Y-shaped end piece of the superconducting magnet of the present invention.

FIG. 5 is a diagram showing the wrapping process of the Y-shaped end piece GK composite tape of the superconducting magnet of the present invention.

FIG. 6 is an overall schematic diagram of the insulation treatment of the Y-shaped end piece of the superconducting magnet of the present invention.

detailed description

The present invention is further described below with reference to the drawings and embodiments.

As shown in FIGS. 1 to 6, a method for insulating the outlet end of a superconducting magnet with a Y-shaped tail end structure includes a superconductor 1 and a conductor end piece 2. One end of the tail side of the superconductor 1 is connected to the side of the conductor end piece 2 by welding to form a Y-shaped structure. The superconductor 1 serves as a branch of the Y-shaped structure. In the conductor end piece 2, the section where the superconductor 1 is connected to the end of the conductor end piece 2 serves as another branch of the Y-shaped structure. A section from the connection point of the superconductor 1 to the other end of the conductor end piece 2 serves as the root 3 of the Y-shaped structure. The insulation treatment method includes the following steps:

1) First, wrap the Y-shaped structure tail end connection with a layer of glass fiber cloth, cut the Y-shaped tail end connection glass wire cloth according to the dotted line, and wrap the cut glass wire cloth onto the superconductor 1, using polyacryl Imine tape is fixed. Wrap a layer of glass cloth on the end piece 2 of the conductor from the Y-shaped structure connection and fix it with polyimide tape. A layer of glass wool cloth is wrapped from the junction of the superconductor 1 to the other end of the conductor end piece 2. Then trim the glass cloth to the required size, as shown in Figure 2.

2) According to the method of step 1), wrap a layer of polyimide film on the glass fiber cloth inside and outside the outlet end of the superconducting magnet, trim it to a distance of 4 mm from the edge of the glass fiber cloth, and fix the edge with polyimide tape, as shown in the figure 3 shown.

3) Lay a layer of glass cloth and a layer of polyimide film on the inner side of the bifurcation of the Y-shaped connection. The ends are fixed with polyimide tape, as shown in Figure 4.

4) From the Y-shaped connection point of the conductor, the first end of the conductor end piece 2 is 140 mm forward and half-wrapped with a layer of GK tape. The GK tape is a laminated structure of glass ribbon and polyimide film, K is below, G is on. Wrap it to the Y-shaped end, cut the polyimide film in the GK tape, wrap the glass ribbon to the Y-shaped end of the superconductor 1 distance, and then smoothly transition to the conductor end welded part, and According to the GK tape structure, the conductor end piece 2 is half-wrapped and wrapped to a distance of 100 mm, as shown in FIG. 5.

5) The corresponding superconductor 1 is half-wrapped according to the GK tape structure, which is 40 mm away from the upper edge of the superconductor in step 1), as shown in Figure 5;

6) Follow the steps from 1) to 5) and perform this operation 4 more times.

7) From the Y-shaped connection point of the conductor, a layer of glass ribbon is half-wrapped from the 140 mm section forward of the other end of the tail end piece 2 of the conductor. Wrap it to the Y-shaped end, wrap the glass ribbon to the Y-shaped end of the superconductor 1 at a distance, and then smoothly transition to the conductor end welding part, and wrap the conductor end to a distance of 100mm segment.

8) Wrap the glass ribbon on the corresponding superconductor 1 in a half-stack to the distance 40mm from the upper edge of the superconductor 1 in step 1);

The glass cloth at the Y-shaped end is: 125mm wide and 0.25mm thick high-strength glass cloth; the polyimide film size is: thickness 0.05mm; G in the GK tape is 40mm wide and 0.25mm thick high-strength glass ribbon, K : 32mm wide and 0.025mm thick polyimide film.

The insulation method of the outlet end of the superconducting magnet is finally filled and cured by vacuum pressure impregnation.

Claims

An insulation treatment method for the outlet end of a superconducting magnet with a Y-shaped tail structure. The outlet end of the superconducting magnet includes a superconductor and a conductor end piece. One end of the superconductor tail side is connected to the side of the conductor end piece by welding to form a Y-shaped structure. The superconductor serves as a fork of the Y-shaped structure. In the conductor end piece, the section from the superconductor connection to the end of the conductor end piece serves as the other fork of the Y-shaped structure, and the section from the superconductor connection point to the other end of the conductor end piece serves as The root of the Y-shaped structure is characterized by the following steps:

1) First, wrap the Y-shaped structure tail end connection with a layer of glass fiber cloth, cut the Y-shaped tail end connection glass fiber cloth, and wrap the cut glass fiber cloth onto the superconductor, using polyimide tape Fixing; Wrap a layer of glass cloth at the end of the conductor from the Y-shaped structure connection, and use polyimide tape to fix it; Wrap a layer of glass cloth at the other end of the end of the conductor from the Y-shaped conductor connection; Then wrap the glass cloth Trim to the required size;

2) According to the method of step 1), wrap a layer of polyimide film on the inner and outer glass fiber cloth of the outlet end of the superconducting magnet, trim it to a distance of 4mm from the edge of the glass fiber cloth, and fix the edge with polyimide tape;

3) Lay a layer of glass cloth and a layer of polyimide film on the inside of the bifurcation at the Y-shaped connection, and use polyimide tape to fix the ends;

4) From the Y-shaped connection point of the conductor, a layer of GK tape is half-wrapped 140 mm forward from the other end of the tail end piece of the conductor, the GK tape is a laminated structure of glass ribbon and polyimide film, K is below, G is above After wrapping to the Y-shaped end, cut the polyimide film in the GK tape, wrap the glass ribbon to the end of the Y-shaped end of the superconductor, and then smoothly transition to the conductor end welding part, and According to the GK tape structure half-wrapped on the end piece of the conductor, wrapped to a distance of 100mm;

5) The corresponding superconductor is half-wrapped according to the GK tape structure, 40 mm away from the upper edge of the superconductor wrapped in glass cloth in step 1);

6) Follow the method from step 1) to step 5), and perform 4 more operations;

7) From the Y-shaped connection point of the conductor to the other end of the conductor end piece 140mm forward, half-wrapped a layer of glass ribbon; wrap to the Y-shaped tail end, wrap the glass ribbon to the end of the Y-shaped superconductor distance Afterwards, the transition to the conductor tail is smooth, and the conductor tail is wrapped to a distance of 100mm;

8) Wrap the glass ribbon on the corresponding superconductor in a half-stack to a distance of 40 mm from the upper edge of the superconductor in step 1).
The insulation treatment method for the outlet end of the superconducting magnet with Y-shaped tail structure according to claim 1, characterized in that: the glass cloth at the Y-shaped tail end is: 125mm wide and 0.25mm thick high-strength glass cloth ; Polyimide film size: thickness 0.05mm; GK tape G is 40mm wide, 0.25mm thick high-strength glass ribbon, K is 32mm wide, 0.025mm thick polyimide film.
The insulation treatment method for the outlet end of the superconducting magnet with Y-shaped tail structure according to claim 1, characterized in that the outlet end of the outlet of the superconducting magnet is finally filled and cured by an insulation method impregnated with vacuum pressure.